[U-Boot] [PATCH v2 10/10] mmc: zynq: Add fdt max-frequency support

[Jaehoon Chung]

On 01/18/2017 12:27 AM, stefan.herbrechtsmeier at weidmueller.com wrote:
> From: Stefan Herbrechtsmeier <stefan.herbrechtsmeier at weidmueller.com>
> 
> The maximum supported peripheral clock frequency of the zynq depends on
> the IO routing. The MIO and EMIO support a maximum frequency of 50 MHz
> respectively 25 MHz. Use the max-frequency value of the device tree to
> determine the maximal supported peripheral clock frequency.
> 
> Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier at weidmueller.com>
> Acked-by: Michal Simek <michal.simek at xilinx.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> 
> ---
> 
> Changes in v2:
> - Add patch to add fdt max-frequency support to zynq mmc driver
> 
>  drivers/mmc/zynq_sdhci.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c
> index c73a4d3..28cedf0 100644
> --- a/drivers/mmc/zynq_sdhci.c
> +++ b/drivers/mmc/zynq_sdhci.c
> @@ -14,6 +14,8 @@
>  #include <malloc.h>
>  #include <sdhci.h>
>  
> +DECLARE_GLOBAL_DATA_PTR;
> +
>  #ifndef CONFIG_ZYNQ_SDHCI_MIN_FREQ
>  # define CONFIG_ZYNQ_SDHCI_MIN_FREQ	0
>  #endif
> @@ -21,6 +23,7 @@
>  struct arasan_sdhci_plat {
>  	struct mmc_config cfg;
>  	struct mmc mmc;
> +	unsigned int f_max;
>  };
>  
>  static int arasan_sdhci_probe(struct udevice *dev)
> @@ -60,7 +63,7 @@ static int arasan_sdhci_probe(struct udevice *dev)
>  
>  	host->max_clk = clock;
>  
> -	ret = sdhci_setup_cfg(&plat->cfg, host, CONFIG_ZYNQ_SDHCI_MAX_FREQ,
> +	ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
>  			      CONFIG_ZYNQ_SDHCI_MIN_FREQ);
>  	host->mmc = &plat->mmc;
>  	if (ret)
> @@ -74,11 +77,15 @@ static int arasan_sdhci_probe(struct udevice *dev)
>  
>  static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
>  {
> +	struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
>  	struct sdhci_host *host = dev_get_priv(dev);
>  
>  	host->name = dev->name;
>  	host->ioaddr = (void *)dev_get_addr(dev);
>  
> +	plat->f_max = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
> +				"max-frequency", CONFIG_ZYNQ_SDHCI_MAX_FREQ);
> +
>  	return 0;
>  }
>  
>